Calculus IV
15.Functions of Several Variables
16.Multiple Integration
17.Vector Analysis
S = contains supplemental resources
Course: Calculus II
Topic: Geometry
Subtopic: Arc Length


In this lesson we will use definite integrals to find the length of an arc, that is, the length of a portion of a curve. If the curve is a regular shape, such as an ellipse, then we have a formula to find its perimeter. However, if the curve is irregular then calculus is needed to find its length. The plan will be, as usual, to find the length of a tiny piece of the curve then add the little lengths up to get the arc length.


By the end of this topic you should know and be prepared to be tested on:


Define: arc of a curve, central angle, subtends (as in "the angle subtends the arc")

Supplemental Resources (optional)

Video: Arc Length and Surface Area, Selwyn Hollis's Video Calculus (watch 1st half)

Lesson: Lengths of Curves and Areas of Surfaces of Revolution, Dale Hoffman's Contemporary Calculus (study arc length sections)